We may not all achieve a high level of technical mastery enabling us to ward off the attacks of a skilled and aggressive opponent, even after many years of training. But, at the very least, we should be able to maintain a healthy life-style and keep our bodies flexible and well-conditioned even into advanced age. This is within the capacity of everyone and does not require any special genetic predisposition or extraordinary athletic skills. When many of us reach instructor level after a certain period of training, we gradually turn into passive supervisors rather than vigorous participants.
~ Stan Pranin
That link takes you into the “members only” area of the Aikido Journal web site. If you are an Aikido student, you should immediately join — the fee is minimal and supports Stan’s great work. If you are not an Aikido student, but really want to read this, let me know… I can make you a copy from the Aikido Journal issue.